Typewriting machine



e. w. CAMPBELL.

TYIEWRITING MACHINE.

APPLICATION FILED JAN. 1|, 192|.

15,433,935., 'muted m3191922 N 2 SHEETS-SHED l. f /77/ G. W. CAMPBELL.

TYPEWRITING MACHINE. APPLICATION FILED JAN.11.1921.

L T. 9H 1H 34 IS .MH 0M S d2 m .m P

l Patented-Get.. 3l, 1922.

muren s'rn'rrt-sv Y rnxrlirrl OFFICE.

GEORGE W. CAMPBELL, 0F HARTFORD, CONNECTICUT, ASSIGNOR TO UNDERWOODTYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWMTING MACHINE.

Application filed January 11, 1921. Serial No. 436,431.

down to receive impressions from the other,

types. p

A feature of the invent-ion comprises a novel form of loc-king orholding means, which may co-operate with the shift-frame,

to ret-ain the platen in its normal position; i the holding means beingoperable by the shift-keys to release. the shift-frame.

Another feat-ure resides in spring mechanism to restore the shift-frameto, and hold it in, normal position. I

Still another featurel relates to means to maintain a permanentconnection between the shiftlframe and the guide-arm therefor.

A further feature of the invention resides in the bearings .for arock-shaft of the caseshifting mechanism. i

Other features and advantages will hereinafter appear. f

kIn the accompanying drawings,

Figure `1 is an elevation of the machine, as seen from the left-handside of the ma.- chine, parts being broken away to show the interiorstructure. f v

Figure 2 is a. fragmentary side elevation, showing the shift-frame movedto its lower position by the depression of one of the shiftkeys.

Figure 3 shows the shift-frame moved to its upper position by the otherkey.

Figure 4 is a view o-f the shift-key lever actions Figure 5 is a topplan view of the machine, showing the case-sl1ifting mechanism; thecarriage being removed. fw

Figure 6 is a. detail. sectional view, taken o n the line 6-6 of Figure3', and shows the is a view similar to Figure 2, and' latch fonmaintaining the connection between the shift-frame and one of theguidearms. Y

F 'igure' 7 is adetail sectional view, taken on the line 7--7 of Figure3, and shows the manner of fastening the spring mechanism for theshift-frame. d

Figure 8 is a det-ail'sectional View, taken on the line 8 of Figure 2,and shows one of the end bearings for the rock-shaft. of theoase-shifting mechanism. i.

Figure 9 is a diagrammatic` side view, showing the holding mea-nsoperated by one of the shift-keys to release the shift-frame before thelatter is moved to its lower position. I'-

Figure 10 is a similar view, and shows the locking means operated by theother shiftkey to release the shift-frame before it 'is raised to itsupper position.

@The invention is herein shown as applied to an Underwood portabletypewriter, disclosed inthe 1,297,085, dated arch 11, 1919, an nin thepatent to Dobson, No. 1,335,956, dated Aprill 6, 1920. Each type-bar 10is provided `with three types 11, 12 andw13 to print against the frontof ay platen '14 when the latter. is

atent to Burridcre, No.

in upper, middle, and lower position, respecf' tively. The type-bars 10may be operated by keys `(not shown.) fThe platen is sup- `ported" in acarriage 15 which moves lia/ck and forth on rails 16 and 16a, forming'part of a shift-frame 17, having end plates-18I and 19 (Figures 1 and5). The shift-frame 17 is mounted for up-and-down movement in a mainframel 2l, the latter comp-rising side plates 22 and 23 joined to eachother by cross-bars 24' and 25. The shift-frame 17 is guided relativelyto the main frame 21 by links 26 and 27 pivotally mounted on the sidelates 22 and 23, respectively, at 28. The links extend forward and areconnected to the end plates 18l and 19 of the shift-frame by screws 30and 31. To assist in guiding 32 and 33 are provided, one at each side ofthe machine. These arms extend forwardly the shift-frame in itsmovements, two arms 38 in the end plates of the shift-frame.

To ac-tuate the shift-frame 17, there may be connected therewith anoperating arm 40 permanently secured to and extending forwardly from therock-shaft 34. The forward end of the operating arm 4() is provided witha lateralv projection or lip 41 (Figures 3, 5 and 1G), which may beengaged, when it is'desired to shift the platen vfrom middle to upperposition, by a rearwardly-extending arm 42 of a shift-key lever 43pivoted at 44 on a bracket 45 secured to the cross-bar 25 of the mainframe 21. The lever 43 may be depressed by a key 46 thereon, and isprovided with a return spring 47 connected to an extension 49 of thelever, said extension engaging with the cross-bar 25 when the shift-keyis in its normal posit-ion (Figures' 1 and 4).

To shift the platen from middle to lower position, there is provided avshifteke-y 48, mounted on the forward end of a shift-lever 50, pivotedat 51 on a bracket 52 secured to the crossbar 24 (Figures 1, 4 and 5).The key-lever 50. has pivotally mounted thereon at 52a an intermediatelever 53, one end 54 thereof engaging the cross-bar 25, the 'latterserving as an abutment or fulcrum-plate for the intermediate lever. Whenthe key-lever 50 is depressed; the rear end 55 of the in- `termediateklever 53, moves downwardly to actuate the operating arm 40 and rock theshaft 34 in a clockwise direction, thus lowering the forward ends of theguide-arms 32 and 33, and, consequently, the shift-frame 17. Thekey-lever 50 and intermediate lever 53 are provided with a returnspring55"L connectedh to the bracket' 52 and to the forward arm of theintermediate lever 53.

Stops 56 and 57 are provided to limit thel store `the` shift-frame withthe platen from its extreme positions to normal. The spring mechanismmay comprise a wire having a loop' 60 to'l embrace the rock-shaft 34.yTwo Varms or elements 61 and 62 extend from the loop 60 and engage an'abutment' 63 on a bracket 64 secured to the side plate 22 of the mainframe. The spring mechanism is located adjacent the guide-arm 32, andis'held in lace'thereon by a strap 65 secured tosai arm, Figures 3 andsaid strap having a groove 66 to embrace the spring arms 61 and 62. Byan inspection of Figure 2, it Will be seen that the spring arm 61 iseffective to restore the shift-frame. In Figure 3 the spring arm 62 iseffective.

The platen 14 may be held in its middle y position by locking mechanismco-operating with the shift-frame 17. Said locking mechanism maycomprise a bail 67 pivoted on the main frame 21 by screws 68 said bailhaving two arms 70, with projections 71, the latter engaging in openings72 of brackets 73 on the shifteframe. rlhe brackets 73 are held in placeon the shift-frame by screws 74, and are slightly adjustable (Figure 9),so as to facilitate the correct positioning of the platen in its middleposition relatively to the types 12,.

The locking bail 67 is operable by the shiftkeys 46 and 48 during theinitial parts of their downward movements, to release the shift-frame sothat the platen may be shifted. To this end, the shift-key 46 whichshifts the platen to upper position is provided with a lip 75 to engagean arm 76 secured to a cross bar 77 of the bail 67, to swing the latterabout/its pivot 68 and withdraw the projections 71 from the holes 72, asseen in Figure 10. By an inspection of Figures 1 and 4, it will be seenthat there is a lost motion between the arm 42 of the key-lever 43 andthe operating arm 40, so that the locking bail may be moved to itsineffective position (Figure 10) before thal lkey-lever engages theoperating arm to actuate the shift-frame. While the latter is released,as in Figure 10, the spring mechanism comprising the arms .61 and 62 iseffective to hold the shift-frame in its middle position. A furtherdepression of the shift-key 46, however, moves the shiftframe upwardly,againstthe tension o-f the spring arm 62, to the position indicated inFigure 3.

To 'actuate the locking bail by the other key-lever, there may beprovided on the keylever 50 a follower 78 to engage a cam 80' on an arm81 secured to the cross-bar 77 of the holding bail, to swing it to theposition indicated in Figure 9. At this time lost motion between theintern'iediate lever 53 and the operating arm 40, Figures 1 and 4, willhave been taken up. A. further depression of the shift-key 48 iseffective to move the shift-frame to its lower position, F igure` 2,against the tension of the springr arm 61.

As hereinbeforc stated, the spring mech anism is effec-tive to restorethe shift-frame cate the shift-frame in this position, afterit isreturned by either one of the spring arms 61 and 62, the projections 71on the locking bail 67 may be in the form of tapered studs that they mayreadily find their way into the holes 72 in the shift-frame when thelocking bail is restored to normal position by means v0f a return spring82, one end of which is connected with the locking bail, the other endbeing anchored on thel main frame 2l.

lt will be understood that any suitable form of locking device may beassociated with the key-levers 43 and 5() to hold them, if so desired,in their operated positions; various forms of locking devices beingshown in the patents to Bul-ridge and Dobson, above mentioned.

F or convenience in assembling the shiftframe 17 on the main frame 2'1,the slots 38 in the shift-frame are vertically disposed, so that it maybe set in from the top of the main frame on the studs of the guide-arms32 and 33. The guldedlnks 26 and 27 may then be connected to theshiftframe by the screws 30 and 31. It is desirable to secure the studs37 in the slots 38 to maintain the connection between the shiftframe 17and the operating arm 40 during case-shifting ope-rations. For thispurpose, there is provided on each of the end plates 18 and 19 a latch83. The latches (Figures 3 and 5) may be swung about their pivots i 79to embrace the studs 37 to keep them in the slots 38. The latches may befrictionally held in position against the end plates. They may be swungrearwardly about their pivots and clear of the studs 37 in assembling ordisassembling.

To reduce friction to a minimum and to facilitate the assembling of therock-shaft 34 of the case-shift mechanism, said rockshaft may be mountedat each endron a roller bearing unit 35, as hereinbefore stated. Eachunit 35 (Figure 8) may comprise a stud 84 projecting from av plate 85secured to the main frame 21 by a screw 86. Rollers 87 are containedwithin the hole 36 and bear against the stud 84. The rollers 87 may bereduced at their ends 88 to project into grooves 90 and 91. The groove90 may be formed in flange 92 of the stud 84. The groove 91 at the otherends of the rollers may be formed by the stud and a liange 93 of a disk94, which may. be secured to `the stud in any convenient manner. Thus.there is provided the roller bearing comprising the arm or plate 85, thestud 84 and the rollers 87 which may be assembled a Single unit 35. Therollers of each unit may then be readily inserted through holes 95 inthe main frame 21, and into the holes 36 at the ends of the rock-shaft34 in assembling the latter on the main frame 21. Variations may beresorted to within the scope ofthe invention, and portions of theimprovements may be used without others. Having thus described myinvention, I claim: i

1. In a typewriting machine, in combination. a case-shift-frame, springmeans for yieldably holding said case-shift-frame in 1ts normalposition, means to lock said frame in its normal position including ashiftable frame having a tapered pin to enter an opening,r in thecase-shift-frame, means for shifting the case-shift-frame from itsnormal position. the shifting means including a shaft, operatingconnections between said shaft and said case-shift-framc, an armprojecting from said shaft, a shift-key-lever, an intermediate leverpivoted on said shift-keylcver, and an abutment to engage one end ofsaid intermediate lever so that depression of the key-lever will actuatesaid intermediate lever to engage said arm to shift saidcase-shiftframe, and cam means on said key-lever and shiftable framewhereby depression of the former will shift the latter to ineffectiveposition.

2. In a typewriting machine, in combination, a case-shift-frame, s )ringmeans for yieldably holding said case-s ift-frame in its normalposition, means for shifting said case-Shift-frame comprising anactuating arm connected with said shift-frame, two shift-key-levers, oneof said key-levers engaging directly with said actuating arm to operatethe latter to move the shift-frame in one direction from its normalposition, an intermediate lever pivoted on the other keylever, anabutment for the intermediate lever, the latter engaging the actuatingarm, when the associated key-lever is actuated, to move the shift-framefrom its normal position in a direction opposite to that effected by thelever engaging directly with the actuating arm, and a spring to resistthe turning of said intermediate lever relatively to the associatedkey-lever and to re turn the latter to its normal position whenreleased. f

3. In a typewriting machine. in combination, a case-shift-frame, springmeans .for yieldably holding said case-shift-frame in its normalposition, shift-frame actuating means comprising an actuating armconnected with the shift-frame, a key-lever, an intermediate leverpivoted thereon, an abutment for the intermediate leve-r, the latterengaging the actuating arm to move said frame in one direction from itsnormal position. a spring to resist the movement of the intermediatelever relatively to the key-lever and to return the latter to normalposition. a locking device to retain said ,frame in normal position torelieve the return-spring of the weight. of said frame.

means operable by the key-'lever to actuate the locking device torelease said shift-frame prior to a shifting operation. and areturnspring for the locking device.

4. In case-shifting mechanism, the combination of a shift-frame, anactuating arm connected with said shift-frame, two shift keylevers, oneof said levers engaging directly with said actuating arm to operate thelatter to move the shift-frame upwardly from its normal position, anintermediate lever pivoted on the other key-lever, an abutment for theintermediate lever, the latter engaging the actuating arm when theassociated key-lever is actuated, to move the shift-frame downwardlyfrom its normal position, stops to limit the movements of said frame inboth directions, a spring to` return said frame to normal, and a lockingdevice controlled 'by said key-levers to hold said shift-frame in normalposition.

5. In case-shiftin mechanism, the combination of a shiftrame, anactuating arm connected with said shift-frame, aYkey-lever, anintermediate lever pivoted thereon, an abutment for the intermediatelever, the latter engaging the actuating Jarm to move said framedownwardly from its normal position, a stop to limit the downwardmovement of said frame, a return spring for said frame, a locking deviceto retain said frame in normal position and to relieve the return springof the weight ofl said frame, means operable by the key-lever to actuatethe locking device to release said frame prior to a shifting operation,and a return spring for the locking device.

6. In case-shifting mechanism, the combination of a shift-frame, anactuating arm connected with saidv fra-me, a key-lever, an intermediatelever pivoted thereon, an abutment for the intermediate lever, thelatter engaging-the actuating arm to move said frame downwardly from itsnorma-l position, a stop to limit the downward movement of s'aid frame,and a return spring for y said frame.

7. In case-shifting mechanism, the combination of a shift-frame havingholes, keylevers to actuate said frame in two directions from a middleposition, stops to limit the movements of said frame in both directions,a pivoted bail, tapered studs on said bail to enter the holes in saidframe, arms on said bail to be engaged by said levers `to operate saidbail to release said frame prior to the movement of the latter, and aspring to hold said frame in its middle position, the frame beingmovable against the tension' of said spring, said tapered studs beingeffective to accurately locate said frame when the latter is restored toits middle position. i

8. In a typewriting machine, in combination, a case-shift-frame, springmeans for yieldably holding said case-shift-frame in lts normalposition, case-shift-frame actuating means including an actuating armconnected ,with said frame, a key-lever, an intermediate lever pivotedthereon, an abut` ment to engage said intermediate lever to turn thesame relatively to the key-lever when the latter is depressed, theintermediate lever engaging the actuating arm to move the frame `fromits normall position, a stop to limit the movement of said frame b saidkey-lever, a return-spring for said rame,

and a spring to resist the turning of said intermediate lever relativelyto the key-lever and to return the intermediate lever and the key-leverto their normal positions when the key-lever is released.

9. In case-shifting mechanism, the combination of a shift-frame, arock-shaft, a keyoperated arm on said rock-shaft to actuate said framein two directions from a middle or normal position, spring mechanism toreturn the frame to its normal position, said spring mechanism includinga spring having a loop to embrace the rock-shaft and two arms extendingfrom said loop, said arms having contacting portions close to the loopand then spread apart to form parallel portions, a holding device toembrace the contacting portions of said arms and hold them closetogether, said holdln device being fastened to said key-operate arm tohold the spring relatively thereto, and a fixed abutment extendingbetween the sprlng arms and normally embraced thereby.

10. In a typewriting machine, in combination, a case-shift-framecomprising two side members, means including a spring to maintain the.case-shit-frame in its mifldle or normal position, locking means forsaid case-shift-frame comprising two arms ivoted at their lower ends andprovide -at their upper ends with tapered projections to enter openingsin the front ends of the respective side members, a bar connecting thelower ends of said arms, an arm extending upwardly from Said bar at therear thereof and curved to the rear at its upper end to. form a hook, anarm extending forwardly from said bar and then upwardly, a cam on therear face of the upwardly-extending portion of the last-mentioned arm,shifting means for the case-shiftframe including two key-leversextending from the front ofthe machine toward the rear thereof, onepivoted intermediate of its ends and having provisions on its rear armto engage said hook and thereby release said case-shift-frame, and theother key-lever pivoted at its rear end and provided with a follower toengage said cam and release said case-shift-frame, and means wherebydepression of one of said key-levers, after effecting release of`the'case-shift-frame, will lcause the latter to be shifted in onedirection, and depression of the other key-lever, af-

ter effecting release of the case-shift-frame, will cause a shifting ofthe case-shift-frame in the opposite direction.

11. In a typewriting machine, in combination, a platen, a platencarriage, a vertically-movable shift-frame on which said platen carriageis mounted to travel transversely of the machine and with which theplaten carriage is removable from the machine, said shift-framecomprising side members each having a vertical open slot at its loweredge,'a transverse shaft, arms projecting substantially horizontallyfrom said shaft adjacent said side members, studs projecting laterallyfrom said arms in such positions that, when the shift-frame is insertedinto the machine from above, the studs will be received in said slots,and latches to hold said studs in said slots.

12. Thel combination with a main frame, of case-shifting mechanismcomprising `a rock-shaft and r'oller bearings for said rockshaft, eachroller bearing comprising an arm, a stud on said arm, rollers to bearagainst said stud, reduced ends on said rollers, and flanges on saidstud to engage the reduced ends to hold the rollers on the stud, eachroller bearing being detachably mounted on the main frame.

13. The combination with a main frame, of case-shifting mechanismcomprising a rock-shaft and roller bearings 'for said rockshaft, eachroller bearing comprising an arm, a stud on said arm, rollers to bearagainst said stud, reduced ends-on said rol- 1ers, a flange having agroove therein on said stud, and a disk secured to said stud, said diskhaving a flange to form a groove with said stud, the -reduced ends ofthe rollers engaging in said grooves to hold the rollers on the stud.

14. In a typewriting machine, in combination, a platen, a platencarriage, a vertically-movable shift-frame on which said platen carriageis mounted to travel transversely of the machine and with which theplaten carriage is removable from the machine, said shift-framecomprising side i members each having a vertical open slot at its loweredge and a flange at its lower edge, a transverse shaft, armslprojecting substantially horizontally from-said shaft adjacent saidside members, studs project- 'ing laterally from said arms in such posi--studs in said. slots, and adjustable stops above and below each flange.to limit the upward and downward movement of the shiftframe.

15. In a typewriting machine, in combination, a case-shift-frame, meansfor shifting said frame comprisin a forwardly-extending actuating arm, as ift-key-lever pivoted at the rear of the forward end of said arm, anintermediate lever pivoted on said shift-key-lever, the rear end of therearwardly-extending arm of said intermediate lever overlying thefrontend of said actuating arm, and the forward arm of said intermediatelever extending forwardly and downwardly, an abutment on which saidforward arm rests, a springtohold the forward arm against said abutmentand thereby hold the rear end of the intermediate lever and also thekey-lever in raised position, al second shift-key-lever pivoted at thefront of the forward end of said actuating arm and having the rear endof the rearwardly-extending arm underlying the front end of saidactuating arm, sald second lever having a downwardly-extending lingermally holding ment.

said finger against said @but- .to engage said abutment, and a springnor-

